RTF is a global modification that replaces all towns in the game.

That's funny. I also hang out there regularly :)

But keep in mind: the balance there is also far from perfect.

The main thing I don't like about Heroes is the presence of the so-called "final battle," which is often the only instance of interaction between players, because the entire game before the final battle is just a tedious grind through neutral creatures (you can do this in single-player and not bother with online play), and the entire game after is simply non-existent.
To turn Heroes into a decent strategy game, it is necessary to increase the importance of territory control, encourage players to have multiple armies, and also significantly reduce the number of neutral armies so as not to focus on boring, monotonous battles with mobs, but to fight against players.
Here, you either need to create maps manually or rework the map generator – maps should have a minimum number of neutral units, the number of cities on maps should be significantly increased, and the building schemes should be edited.
It would also be good to somehow solve the issue with the heroes themselves – losing the main hero often means defeat, so at least the "Shackles of War" artifact should be banned, or the losing hero should be sent to the tavern of the winning player so that he can be hired immediately.
Victory over a player means depriving him of all his troops and cities, not winning the "final battle," and losing the "final battle" should not deprive you of your chances of overall victory.